. This 8-inch extension bar will, when used with an electric or pneumatic impact wrench, limit the effective output of the wrench to 140 ft-lb of torque and anything above that will cause the extension to flex and absorb the extra impact.1/2" Drive Aqua 140 ft-lb Torque Extension This torque stick is made of resilient chrome molybdenum (Chromoly) steel that has a aqua powder coat to make it easy to pick out among other tools or in a crowded toolbox. The STEELMAN 50094A is designed to prevent damage to wheels, studs, and brake rotors by reducing the risk of overtightening which can result in sheared stud bolts, rounded lug nuts, and warped rotors.